<template>
  <el-container class="home-container">
    <!-- 头部区 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>梦龙龙后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu :default-active="activePath" router :collapse-transition="false" :collapse="isCollapse" unique-opened background-color="#313743" text-color="#fff" active-text-color="#4198fb">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item @click="saveNavState('/' + data.path)" :index="'/' + data.path" v-for="data in item.children" :key="data.id">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{data.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist:[],
      iconsObj:{
        '125':'el-icon-user',
        '103':'el-icon-set-up',
        '101':'el-icon-goods',
        '102':'el-icon-document-copy',
        '145':'el-icon-s-data'
      },
      // 是否折叠
      isCollapse:false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    // 把activePath取出来激活链接的高亮状态
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList() {
      // 获取所有的菜单
      const { data: res } = await this.$http.get('menus')
      if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
    },
    // 点击按钮切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 25px;
    div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
        text-shadow: 2px 2px 3px yellowgreen;
        animation: textmove 2s linear infinite alternate;
      }
      @keyframes textmove {
        from {
          text-shadow: 1px 1px 1px yellowgreen;
        }
        to {
          text-shadow: 2px 2px 2px skyblue;
        }
      }
    }
  }
  .el-aside {
    background-color: #313743;
    transition: 0.5s all;
    .el-menu{
      border-right: 0px;
    }
  }
  .el-main {
    background-color: #e9edf0;
  }
}
.toggle-button{
  background-color: #475165;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  // 设置字母的间距
  letter-spacing: 0.5em;
  cursor: pointer;
}
</style>
